It will only work on a 2.4 ghz. Initially I was disappointed, but then i realized that, since my router allows to have separate networks (1 in the 2.4GHz band and 2 in the 5GHz band), I figured, for the functionality it needs, it does not actually need 5GHz, besides, the less devices you have on a 5GHz band, the faster the data communication between the router and them, and since I barely use the 2.4 band, having devices like this one on that band is beneficial.